CVE-2023-37003Network attack vector

Remote MME crash via missing S1AP identifier

Published Jan 22, 2025 · Updated Jan 28, 2025

Reachable assertion in Open5GS MME 2.6.4 and earlier allows remote attackers to crash the service via a malformed S1AP message. In src/mme/s1ap-handler.c, a missing MME_UE_S1AP_ID causes error-response generation to fail, after which an assertion aborts the process. Exploitation requires access to the S1AP interface; repeated E-RAB Setup Response messages can repeatedly interrupt the MME service.

CVSS severity5.3
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in Open5GS MME 2.6.4 and earlier allows remote attackers to crash the service via a malformed S1AP message. In src/mme/s1ap-handler.c, a missing MME_UE_S1AP_ID causes error-response generation to fail, after which an assertion aborts the process. Exploitation requires access to the S1AP interface; repeated E-RAB Setup Response messages can repeatedly interrupt the MME service.

The record

CVE
CVE-2023-37003
Published
Jan 22, 2025
Updated
Jan 28, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617, T1499.004
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Jan 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Jan 28, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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